package client;

/**
 * This class for encryption
 * 
 * @author: Topcat Tuppin
 * Last Modified: 10,Mar,2001
 */
public class MD5 {

/* *****************************    MD5 source code start    *******************************/
	/**
	 * Fields
	 */
    static final int S11 = 7;
    static final int S12 = 12;
    static final int S13 = 17;
    static final int S14 = 22;

    static final int S21 = 5;
    static final int S22 = 9;
    static final int S23 = 14;
    static final int S24 = 20;

    static final int S31 = 4;
    static final int S32 = 11;
    static final int S33 = 16;
    static final int S34 = 23;

    static final int S41 = 6;
    static final int S42 = 10;
    static final int S43 = 15;
    static final int S44 = 21;

    static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    
    private long[] state = new long[4];
    private long[] count = new long[2];
    private byte[] buffer = new byte[64];
    
    public String digestHexStr;
    
    private byte[] digest = new byte[16];
    
    /**
     * Default constructor
     */
    public MD5() {
    	md5Init();
    	return;
    }
    
    /**
     * Initializing method
     */
    private void md5Init() {
        count[0] = 0L;
        count[1] = 0L;

        state[0] = 0x67452301L;
        state[1] = 0xefcdab89L;
        state[2] = 0x98badcfeL;
        state[3] = 0x10325476L;

        return;
    }
    
    /**
     * F, G, H, I
     */
    private long F(long x, long y, long z) {
        return (x & y) | ((~x) & z);
    }
    private long G(long x, long y, long z) {
        return (x & z) | (y & (~z));
    }
    private long H(long x, long y, long z) {
        return x ^ y ^ z;
    }
    private long I(long x, long y, long z) {
        return y ^ (x | (~z));
    }
    
    /**
     * FF, GG, HH, II
     */
    private long FF(long a, long b, long c, long d, long x, long s,
            long ac) {
    	a += F (b, c, d) + x + ac;
    	a = ((int) a << s) | ((int) a >>> (32 - s));
    	a += b;
    	return a;
    }
    private long GG(long a, long b, long c, long d, long x, long s,
            long ac) {
    	a += G (b, c, d) + x + ac;
    	a = ((int) a << s) | ((int) a >>> (32 - s));
    	a += b;
    	return a;
    }
    private long HH(long a, long b, long c, long d, long x, long s,
            long ac) {
    	a += H (b, c, d) + x + ac;
    	a = ((int) a << s) | ((int) a >>> (32 - s));
    	a += b;
    	return a;
    }
    private long II(long a, long b, long c, long d, long x, long s,
            long ac) {
    	a += I (b, c, d) + x + ac;
    	a = ((int) a << s) | ((int) a >>> (32 - s));
    	a += b;
    	return a;
    }
    
    /**
     * Update md5 Method
     */
    private void md5Update(byte[] inbuf, int inputLen) {

    	int i, index, partLen;
    	byte[] block = new byte[64];
    	index = (int)(count[0] >>> 3) & 0x3F;
    	
    	if ((count[0] += (inputLen << 3)) < (inputLen << 3))
    			count[1]++;
    	count[1] += (inputLen >>> 29);
    	partLen = 64 - index;

    	if (inputLen >= partLen) {
    			md5Memcpy(buffer, inbuf, index, 0, partLen);
    			md5Transform(buffer);
                for (i = partLen; i + 63 < inputLen; i += 64) {
                        md5Memcpy(block, inbuf, 0, i, 64);
                        md5Transform (block);
                }
                index = 0;
        } else
                i = 0;
    	md5Memcpy(buffer, inbuf, index, i, inputLen - i);
    }
    
    private void md5Final () {
    	byte[] bits = new byte[8];
    	int index, padLen;
    	
    	Encode (bits, count, 8);
    	
    	index = (int)(count[0] >>> 3) & 0x3f;
    	padLen = (index < 56) ? (56 - index) : (120 - index);
    	md5Update (PADDING, padLen);
    	
    	md5Update(bits, 8);
    	
    	Encode (digest, state, 16);
    }
    
    private void md5Memcpy (byte[] output, byte[] input,
    		int outpos, int inpos, int len) {
    	
    	 int i;
    	 for (i = 0; i < len; i++)
    		 output[outpos + i] = input[inpos + i];
    }
    
    private void md5Transform (byte block[]) {
    	
    	long a = state[0], b = state[1], c = state[2], d = state[3];
    	long[] x = new long[16];
    	
    	Decode (x, block, 64);
    	
        /* Round 1 */
        a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
        d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
        c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
        b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
        a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
        d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
        c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
        b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
        a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
        d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
        c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
        b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
        a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
        d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
        c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
        b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */

        /* Round 2 */
        a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
        d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
        c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
        b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
        a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
        d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
        c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
        b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
        a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
        d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
        c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
        b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
        a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
        d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
        c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
        b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */

        /* Round 3 */
        a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
        d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
        c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
        b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
        a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
        d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
        c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
        b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
        a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
        d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
        c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
        b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
        a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
        d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
        c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
        b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */

        /* Round 4 */
        a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
        d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
        c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
        b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
        a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
        d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
        c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
        b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
        a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
        d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
        c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
        b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
        a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
        d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
        c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
        b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */

        state[0] += a;
        state[1] += b;
        state[2] += c;
        state[3] += d;
    }
    
    private void Encode (byte[] output, long[] input, int len) {
    	
    	int i, j;
    	
    	for (i = 0, j = 0; j < len; i++, j += 4) {
    		output[j] = (byte)(input[i] & 0xffL);
    		output[j + 1] = (byte)((input[i] >>> 8) & 0xffL);
    		output[j + 2] = (byte)((input[i] >>> 16) & 0xffL);
    		output[j + 3] = (byte)((input[i] >>> 24) & 0xffL);
    	}
    }
    
    private void Decode (long[] output, byte[] input, int len) {
    	
    	int i, j;
    	
    	for (i = 0, j = 0; j < len; i++, j += 4)
    		 output[i] = b2iu(input[j]) |
    		 	(b2iu(input[j + 1]) << 8) |
    		 	(b2iu(input[j + 2]) << 16) |
    		 	(b2iu(input[j + 3]) << 24);
    	return;
    }
    
    public static long b2iu(byte b) {
    	
    	return b < 0 ? b & 0x7F + 128 : b;
    }
    
    public static String byteHEX(byte ib) {
    	
    	 char[] Digit = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
    	 char [] ob = new char[2];
    	 ob[0] = Digit[(ib >>> 4) & 0X0F];
    	 ob[1] = Digit[ib & 0X0F];
    	 String s = new String(ob);
    	 return s;
    }
    
    /**
     *  Encode(MD5) string to string
     * 
     * @param inbuf
     * 			Message
     * 
     * @return a string represenation of the encrypted message
     */
    public String stringToString(String inbuf) {
    	
    	md5Init();
    	md5Update(inbuf.getBytes(), inbuf.length());
    	md5Final();
    	digestHexStr = "";
    	for (int i = 0; i < 16; i++) {
    		digestHexStr += byteHEX(digest[i]);
    	}
    	return digestHexStr;
    }
    
    /**
     *  Encode(MD5) string to byte[]
     * 
     * @param inbuf
     * 			Message
     * 
     * @return a byte array represenation of the encrypted message
     */
    public byte[] stringToBytes(String inbuf) {
    	
    	md5Init();
    	md5Update(inbuf.getBytes(), inbuf.length());
    	md5Final();
    	return digest;
    }
    
    /**
     *  Encode(MD5) byte[] to string
     * 
     * @param inbuf
     * 			Message
     * 
     * @return a string represenation of the encrypted message
     */
    public String bytesToString(byte[] inbuf) {
    	
    	md5Init();
    	md5Update(inbuf, inbuf.length);
    	md5Final();
    	digestHexStr = "";
    	for (int i = 0; i < 16; i++) {
    		digestHexStr += byteHEX(digest[i]);
    	}
    	return digestHexStr;
    }
    
    /**
     *  Encode(MD5) byte[] to byte[]
     * 
     * @param inbuf
     * 			Message
     * 
     * @return a string represenation of the encrypted message
     */
    public byte[] bytesToTytes(byte[] inbuf) {
    	
    	md5Init();
    	md5Update(inbuf, inbuf.length);
    	md5Final();
    	return digest;
    }
    
    /**
     *  Translate encryped byte[] to a String
     * 
     * @param b
     * 			Encryped message byte-array
     * 
     * @return a string represenation of the encrypted message byte-array
     */
    public String toStr(byte[] b) {
    	
    	digestHexStr = "";
    	for (int i = 0; i < 16; i++) {
    		digestHexStr += byteHEX(b[i]);
    	}
    	return digestHexStr;
    }
    
/**********************     MD5 source code end      ****************************/
    
    
    /**
      * static method for use MD5 encpyption
      * 
      * @param original
      * 			Original message bytes value
      * 
      * @return a byte array represenation the encoded message
     */
    public static byte[] encode(byte[] original) {
    	MD5 md5 = new MD5();
    	return md5.bytesToTytes(original);
    }
    
    public static String forTest(byte[] original) {
    	MD5 md5 = new MD5();
    	return md5.bytesToString(original);
    }
    
}
